自养到异养:南极冰洞融化季节细菌功能的转变。

IF 3.3 4区 生物学 Q2 MICROBIOLOGY
Journal of Microbiology Pub Date : 2024-08-01 Epub Date: 2024-05-30 DOI:10.1007/s12275-024-00140-1
Aritri Sanyal, Runa Antony, Gautami Samui, Meloth Thamban
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引用次数: 0

摘要

居住在冰川表面冰川洞(碎屑、水和营养丰富的生态系统)中的微生物积极参与碳和营养循环。这些群落及其功能在夏季融化季节是如何变化的,目前所知甚少,因为在夏季融化季节,强烈的消融和径流会改变养分和微生物的流入和流出。在这里,我们利用高通量扩增子测序、预测性代谢工具和表型微阵列技术来跟踪南极沿岸一个冰晶洞和周围峡湾中细菌群落和功能在夏季的变化。在整个夏季,冰晶石洞融水中的细菌多样性主要由异养细菌(蛋白质细菌)组成。相关的功能潜力与异养同化和分解途径有关。在夏初和夏末,自养型蓝藻菌系在碎屑群落中占主导地位,而在融水高峰期,异养型类杆菌和变形菌相关菌系则有所增加。基于分类学的预测性功能分析显示,随着融化季节的到来,主要与光营养相关的功能已转向异养同化途径。冰川洞内自养群落向异养群落的转变会影响夏季冰川表面的碳吸收和营养物质释放。此外,冰川洞群落向峡湾的冲刷和输出也会影响峡湾生态系统的生物地球化学动态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Autotrophy to Heterotrophy: Shift in Bacterial Functions During the Melt Season in Antarctic Cryoconite Holes.

Autotrophy to Heterotrophy: Shift in Bacterial Functions During the Melt Season in Antarctic Cryoconite Holes.

Microbes residing in cryoconite holes (debris, water, and nutrient-rich ecosystems) on the glacier surface actively participate in carbon and nutrient cycling. Not much is known about how these communities and their functions change during the summer melt-season when intense ablation and runoff alter the influx and outflux of nutrients and microbes. Here, we use high-throughput-amplicon sequencing, predictive metabolic tools and Phenotype MicroArray techniques to track changes in bacterial communities and functions in cryoconite holes in a coastal Antarctic site and the surrounding fjord, during the summer season. The bacterial diversity in cryoconite hole meltwater was predominantly composed of heterotrophs (Proteobacteria) throughout the season. The associated functional potentials were related to heterotrophic-assimilatory and -dissimilatory pathways. Autotrophic Cyanobacterial lineages dominated the debris community at the beginning and end of summer, while heterotrophic Bacteroidota- and Proteobacteria-related phyla increased during the peak melt period. Predictive functional analyses based on taxonomy show a shift from predominantly phototrophy-related functions to heterotrophic assimilatory pathways as the melt-season progressed. This shift from autotrophic to heterotrophic communities within cryoconite holes can affect carbon drawdown and nutrient liberation from the glacier surface during the summer. In addition, the flushing out and export of cryoconite hole communities to the fjord could influence the biogeochemical dynamics of the fjord ecosystem.

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来源期刊
Journal of Microbiology
Journal of Microbiology 生物-微生物学
CiteScore
5.70
自引率
3.30%
发文量
0
审稿时长
3 months
期刊介绍: Publishes papers that deal with research on microorganisms, including archaea, bacteria, yeasts, fungi, microalgae, protozoa, and simple eukaryotic microorganisms. Topics considered for publication include Microbial Systematics, Evolutionary Microbiology, Microbial Ecology, Environmental Microbiology, Microbial Genetics, Genomics, Molecular Biology, Microbial Physiology, Biochemistry, Microbial Pathogenesis, Host-Microbe Interaction, Systems Microbiology, Synthetic Microbiology, Bioinformatics and Virology. Manuscripts dealing with simple identification of microorganism(s), cloning of a known gene and its expression in a microbial host, and clinical statistics will not be considered for publication by JM.
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